| 黔中喀斯特石漠化区不同土壤类型对常见植物叶片δ13C值的影响 |
| 摘要点击 1703 全文点击 1040 投稿时间：2014-01-27 修订日期：2014-03-24 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 喀斯特石漠化 δ13C值 黄壤 黑色石灰土 水分利用效率 |
| 英文关键词 karst rocky desertification δ13C values yellow soil black calcareous water use efficiency |
|
| 中文摘要 |
| 通过测定黔中喀斯特区清镇市王家寨小流域内常见种叶片δ13C值，探讨土壤类型和石漠化等级对喀斯特植物水分利用效率的影响. 结果表明，小流域内不同土壤类型植物叶片的δ13C值总体差异不显著（P>0.05），黄壤区植物叶片δ13C值分布区间较黑色石灰土区窄，变异系数较小，整体较黑色石灰土区偏负. 小流域内黑色石灰土区植物群落δ13C均值随石漠化进行趋正，黄壤区随石漠化呈现出先趋正后趋负的变化格局. 方差分析结果显示黄壤区各石漠化植物群落δ13C值间不存在显著差异（P>0.05），黑色石灰土区各石漠化植物群落δ13C值间均存在显著（P<0.05）或极显著差异（P<0.01）. 相关分析结果显示黄壤区植物叶片δ13C值的主要影响因子为土厚和坡度，黑色石灰土区为土壤含水量. 研究区土壤对植被δ13C值的影响是通过调节土壤水分实现的. |
| 英文摘要 |
| By measuring the foliar δ13C values of common local plant species grown in different soil types in Wangjiazhai catchments, a typical karst desertification area in Qingzhen City, Central Guizhou, we studied the impact of soil type and rocky desertification grade on the foliar δ13C values. The results showed that the foliar δ13C values were more negative in yellow soil area than those in black calcareous area and there was no obvious difference in foliar δ13C values between these two soil types. The distribution interval of foliar δ13C values in yellow soil area was narrower than those in black calcareous area and the variation coefficient of foliar δ13C values in yellow soil area were smaller than those in black calcareous area. With increasing degree of karst rocky desertification, the foliar δ13C values of plant community in black calcareous area increased, whereas those in yellow soil area first increased and then decreased. The result of multiple comparison showed that the difference in foliar δ13C values of plant community among rocky desertification grade was not obvious in yellow soil area, but it was obvious in black calcareous area. Correlation analysis between the foliar δ13C values of plant species and the main environmental factors indicated that slope and soil thickness were the main factors which affected the foliar δ13C values of plants in yellow soil area and soil water contant was the main factor in black calcareous area. The impact of soil on the foliar δ13C values was realized by adjusting the soil moisture in study area. |
